643510264466317 has 2 divisors, whose sum is σ = 643510264466318. Its totient is φ = 643510264466316.

The previous prime is 643510264466291. The next prime is 643510264466339. The reversal of 643510264466317 is 713664462015346.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 493975250606916 + 149535013859401 = 22225554^2 + 12228451^2 .

It is a cyclic number.

It is not a de Polignac number, because 643510264466317 - 2¹⁵ = 643510264433549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643510264466917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321755132233158 + 321755132233159.

It is an arithmetic number, because the mean of its divisors is an integer number (321755132233159).

Almost surely, 2^{643510264466317} is an apocalyptic number.

It is an amenable number.

643510264466317 is a deficient number, since it is larger than the sum of its proper divisors (1).

643510264466317 is an equidigital number, since it uses as much as digits as its factorization.

643510264466317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52254720, while the sum is 58.

The spelling of 643510264466317 in words is "six hundred forty-three trillion, five hundred ten billion, two hundred sixty-four million, four hundred sixty-six thousand, three hundred seventeen".